Given the set of schools shown below, Find the weighted standard distance for the schools.
= 400 * (5.4 - 1.4)² + 1000 * (1.2 - 1.4)² + 3000 * (0.5 - 1.4)² + 1500 *(2.1 - 1.4)² =9594.4
= = 400 *(5.3 - 3.3)² + 1000 *(3.4 - 3.3)² + 3000 *(3.5 - 3.3)² + 1500 * (2.2 - 3.3)² =3541.2
WSD = ?(
+ 
)/(400 + 1000 + 3000 + 1500) = 1.5
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